出处：按学科分类—语言、文字 中国对外翻译出版公司《汉英成语词典》第158页（226字）
极恳切地劝告，例上实验课时，老师谆谆告诫学生，一定要严格遵守实验操作规程。
When her students are in the laboratory，the teacher cautions them not to forget to abide closely the sequence of the experimental process．